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I just bought and down loaded Popcorn from the Roxio site. They had a special and I paid $29.95 so I figured, what the ****?

Anyway, it downloaded as a .sit file. When I click the icon to install it, it says, "There is no default application specified to open the document "Popcorn_10_ESD.sit"". I'm not sure what that means. Do I need a special installer or something? Or can I open this with anything in my OS?

I'm running Tiger OSX (10.4.1). I know there are some issues that Popcorn and Tiger are having as of now, but the people that are having these issues can still install and use it, but only to an extent.

that is a compressed file, use stuffit expander to open it, the installer is inside.
try selecting it and click File>open with>select stuffit expander. or look in your utilities folder, or select the file, click file>get info>in the infoi window, in the open with tab, select stuffit expander, click change all.

StuffIt Expander is no longer included on a fresh installation of Mac OS X. If you installed as an upgrade, your old copy is left untouched, but if you do a clean installation, it isn’t installed.

On the plus side, the faceless BOMArchiveHelper application, which in 10.3 only expanded ‘.zip’ files, now expands ‘.gz’, ‘.tar’, ‘.bz2’, and possibly other open archive formats — and it does so much faster than StuffIt Expander. But, StuffIt’s own file formats (‘.sit’ and ‘.sitx’) aren’t open, and so if you want to be able to open them, you’ll need to install StuffIt Expander on your own.